The SRAM DUB bottom bracket series has a simple job- to connect crankarms and protect the smooth, long-lasting application of power to the drivetrain. SRAM engineered the oversized DUB spindle to work across every bottom bracket standard, simplifying crankarm compatibility.PressFit 121 (Fat Bike)Gutter Seal Technology drastically improves sealing against the elementsSealed cartridge bearingsOne oversized spindle to work across every bottom bracket standardSignificantly lighter than GXP systemItem SpecificationsBB Shell Width (mm)121BB/Frame InterfaceBB121Bottom Bracket Shell I.D.41Defined ColorBlackSpindle Interface TypeSRAM DUB SRAM DUB Non-Threaded Bottom Bracket Bottom Brackets UPC: 710845815737